In order to make a restoration from an snapshopt already

Hi

In order to make a restoration from an snapshopt already archived, if i had made an snaphot of all my files an database ( i mean complete) and a few months later i wanted to make a restoration.
¿is necessary to have installed all the plugins that i had when i made the snapshot? or everything is restored because i have made a complete backup??

I dont really know.
may you help me, thanks