Backup File Types - File extensions used for backup files.
| Extension | File Description | Popularity | |
| .$$$ | Temporary File | Average | |
| .$db | dBASE Temporary File | Average | |
| .001 | Norton Ghost Disk Backup | Common | |
| .001 | HJSplit Split Archive | Average | |
| .113 | Iomega Backup File | Average | |
| .aba | Palm Address Book Archive | Average | |
| .abbu | Address Book Backup | Average | |
| .abk | Automatic Backup | Average | |
| .acr | Acer eRecovery Management Backup File | Uncommon | |
| .as4 | askSam Backup File | Uncommon | |
| .asd | Word AutoSave File | Common | |
| .bac | Backup File | Average | |
| .backupdb | Time Machine Backup Folder | Average | |
| .bak | Backup File | Very Common | |
| .bak | Firefox Bookmarks Backup | Average | |
| .bck | VMX Backup File | Average | |
| .bckp | Ad-Aware Quarantined File | Average | |
| .bcm | Microsoft Works Communications Script Backup | Average | |
| .bdb | Microsoft Works Database Backup File | Average | |
| .bkc | Backup4all Backup Catalog | Average | |
| .bkf | Windows Backup Utility File | Average | |
| .bkp | Backup File | Common | |
| .bks | Microsoft Works Spreadsheet Backup File | Uncommon | |
| .bpa | StorageSync Backup Archive | Average | |
| .bpb | PowerDesigner Business Process Backup File | Uncommon | |
| .bpm | PowerDesigner Business Process Model | Average | |
| .bps | Works Document Backup | Average | |
| .bup | Backup File | Very Common | |
| .bup | DVD IFO Backup File | Average | |
| .cbk | Backup Configuration File | Rare | |
| .ck9 | Cook'n Cookbook Backup File | Uncommon | |
| .da0 | Windows Registry Backup File | Uncommon | |
| .dba | Palm Datebook Backup File | Common | |
| .dbk | dBASE Database Backup | Average | |
| .dna | CA Backup and Migration Backup File | Uncommon | |
| .dov | Temp File | Rare | |
| .fbc | Family Tree Maker for DOS Backup File | Average | |
| .fbf | Free Backup Fix Backup File | Average | |
| .fbk | Microsoft Dynamics NAV Backup File | Average | |
| .fbk | Family Tree Maker for Windows Backup File | Average | |
| .fbu | FEBE Firefox Backup File | Average | |
| .fbw | HP Recovery Manager Backup File | Common | |
| .ful | Microsoft Backup File List | Average | |
| .gb1 | Game Maker Backup File | Average | |
| .gho | Norton Ghost Backup File | Very Common | |
| .ghs | Norton Ghost Image Segment | Average | |
| .ipd | BlackBerry Backup File | Average | |
| .iv2i | Norton Ghost Incremental Virtual Volume Image | Average | |
| .jbk | Juno Backup File | Average | |
| .lcb | Living Cookbook Backup File | Average | |
| .llx | LabVIEW VI Library Backup File | Average | |
| .mem | FoxPro Variable File | Average | |
| .mig | Windows Migration Backup File | Uncommon | |
| .mpb | MyPhoneExplorer Backup File | Uncommon | |
| .nb7 | NovaBACKUP Output File | Average | |
| .nba | Nero BackItUp & Burn Archive | Average | |
| .nbf | Backup Now Archive | Average | |
| .nbf | Nokia Backup File | Average | |
| .nbi | Nero BackItUp Information File | Average | |
| .nbk | NovaBACKUP Backup Script | Average | |
| .nbu | Nokia Phone Backup File | Average | |
| .nco | Nero BackItUp File | Average | |
| .nrs | NovaBACKUP Restore Script | Average | |
| .oeb | Outlook Express Backup Wizard File | Average | |
| .old | Backup File | Common | |
| .onepkg | Microsoft OneNote Package File | Average | |
| .ori | Original File | Very Common | |
| .oyx | Approach Alternate Database Index | Average | |
| .paq | Hewlett-Packard Software Restore File | Average | |
| .pcf | PaintCAD Font | Rare | |
| .pdb | PowerDesigner Database Backup File | Uncommon | |
| .psa | Plesk Backup File | Uncommon | |
| .qbb | QuickBooks Backup File | Average | |
| .qbk | QuickTax Backup File | Average | |
| .qbm | QuickBooks Portable Company File | Average | |
| .qbx | QuickBooks Accountant Transfer File | Average | |
| .qic | Windows Backup File | Average | |
| .qsf | Qualtrics Survey File | Average | |
| .rbc | Retrospect Backup Catalog File | Average | |
| .rbf | Retrospect Backup File | Average | |
| .rbf | Windows Installer Rollback File | Average | |
| .rbk | Windows 95 Registry Backup File | Uncommon | |
| .rbs | Windows Installer Rollback Script | Average | |
| .rdb | Retrospect Backup Set | Average | |
| .rrr | Registry Mechanic Backup File | Average | |
| .sdc | Stardock Central Download Archive | Uncommon | |
| .skb | SketchUp Backup Document | Average | |
| .sn1 | Drive Snapshot First Differential Backup | Average | |
| .sn2 | Drive Snapshot Second Differential Backup | Average | |
| .sna | Drive Snapshot Primary Backup File | Average | |
| .spf | ShadowProtect Full Backup File | Uncommon | |
| .spg | TCP Optimizer Backup File | Average | |
| .spi | ShadowProtect Incremental Backup File | Uncommon | |
| .sqb | SQL Backup SQL Server Backup File | Average | |
| .tbk | FoxPro Memo Backup | Average | |
| .tdb | eBay Turbo Lister Backup File | Average | |
| .tlg | QuickBooks Transaction Log File | Common | |
| .tmp | Temporary File | Very Common | |
| .uci | UFS Explorer Backup File | Average | |
| .v2i | Norton Ghost Virtual Volume Image | Average | |
| .wbk | Word Document Backup | Average | |
| .win | Windows Backup File | Average | |
| .win | FoxPro Window Settings | Average | |
| .wjf | WinZip Job File | Average | |
| .xlk | Excel Backup File | Average |
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