TWRP backup location topic

Folks

I did a full backup of system, data, etc on TWRP (2.66gb total folder size) - can I assume that should I corrupt my phone somehow, I can restore from this and the phone will be in the exact state when I did the backup - all apps, logins, etc intact?

Also, I do weekly backups with titanium free edition - does titanium does the same thing or should I still do the above every few months?

Thanks