Originally Posted by Skanin
Yesterday I unlocked my bootloader, installed CWM and SuperSU. Today I installed the Titanum backup and started backuping. Now I wonder how to restore the backups if the app was deleted once? Let's say I want to install a custom ROM and it wipes all my data. How can I restore the backups I did today?
/starage/sdcard1 (SD Card)
By default TB puts backups in /sdcar0/TitaniumBackup. If you uninstall TB your backups will remain making it a great tool when wiping/switching ROMs. Once TB is re-installed it will read your backups from that folder and you will be able to perform restore functions within the app.
If you do a factory wipe (aka full wipe) in TWRP (not sure about CWM) neither /sdcard0 or /sdcard1 will be touched.
has pointed out there are many ways to backup your backups, and restore backups. TB has many options and ways to backup/restore your data. Similar to Howell, every couple weeks I will copy both /sdcards to my computer for safe keeping. If you buy the pro version (recommended) then you can schedule backups, and have more than one backup of an app - I have found multiple backups useful if an update to an Xposed module breaks certain functions since they aren't always device specific.
Typically I do not backup any system apps or data because as @Don MC
pointed out these don't always restore properly when switching ROMs (even if it's an update to the same ROM). SMS/MMS data is an exception I guess. I have a few system apps such as my lockscreen.apk and SystemUI.apk backed up, but only because they conflicted with some Xposed modules.