PC game osts:KhinsiderDownloader
Switch dumping: nxdumptool + tinfoil
Wii U ripping: Wii U USB helper or dumpling
PS3 backups: nopaystatoon
Pre-patched rom hacks: CDRomance
Other backups or manuals and scans: Internet archive or vimm’s lair
If you have a large steam library, the rin forum has some tools to help backup a good chunk of those games. Usually you can’t run a steam game without the steam client, but steamless and goldberg can make them run without needing the client.
PC game osts:KhinsiderDownloader
Switch dumping: nxdumptool + tinfoil
Wii U ripping: Wii U USB helper or dumpling
PS3 backups: nopaystatoon
Pre-patched rom hacks: CDRomance
Other backups or manuals and scans: Internet archive or vimm’s lair