u/AdAdministrative8066

I've been uploading a fair bit of public domain local history and other content (mainly scans of pictures and PDFs of books) to Wikimedia Commons and Archive.org as I write on Wikipedia more. Since these items are not directly important to me (I'm done using them for research when I upload them) and I don't presently have the digital space personally to have my own physical/cloud backups, I don't do so. But, I acknowledge the frailty and futility of only uploading to two sources. Are there other similar websites to Wikimedia Commons and Archive that I should submit these archival files to, or do I just need to buck up and by my first HDD? Advice appreciated!