If your going to use them as a back up you might as well have an up to date backup. As I mentioned in another thread, NOAA allows free off downloads. Some in the regular format and some in the booklet format.
You can print the booklet ones in regular paper if they cover the area you want.
I actually keep a few here and there on my tablets, and they are very close to being up to date.
Get up to date stuff it’s worth it.