Win HTTrack and FileZilla Backup

Newbie here,

I use Win HTTrack and FileZilla on my local drives and I'm considering the PortableApps approach so I can work from any device with one good up to date backup instead of a bunch of different versions.

Question:
Can someone prep me on how the PA versions of HTTrack and/or FileZilla handle backup. Should I assume it treats the PA site as a cloud.

Also, should I assume this is true for many/most/all Portable Apps.

Thanks for any help