Keep It
DEVONthink
Evernote
EagleFiler
OneNote
Bear
Curio
Numerous
Datto Backupify
Backblaze
CrashPlan
ManageWP
MiniTool Partition Wizard
Druva
Sungard Availability Services
Zoolz
Keep It Datto BackupifyBased on our record, Keep It seems to be more popular. It has been mentiond 10 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
I wonder if Keep It might help you with searching and organizing your library. Source: about 1 year ago
With this one you put your files "into" the app in what is somewhat misleading called "notes". Think of a note as a data container where you can put many file types and edit them later on from within the database app: https://reinventedsoftware.com/keepit/. Source: about 1 year ago
Another option on Mac OS is Keep It. I have used them simultaneously on the same folder. Source: over 1 year ago
I use Keep It [1] on macOS/iOS and save pages as PDFs. [1] http://reinventedsoftware.com/keepit/. - Source: Hacker News / almost 2 years ago
Seeing that you're probably on the Apple ecosystem, is there a reason why Devonthink didn't make your list? Seems like it satisfies all 5 of your criteria. If that for whatever reason doesn't work out, there's also Notebooks or KeepIt. Source: over 2 years ago
DEVONthink - DEVONtechnologies develops DEVONthink, DEVONagent, and other Mac and iOS apps for document and information management and web research.
Backblaze - Backblaze's remote backup automatically backs up your data to our secure datacenter.
Evernote - Bring your life's work together in one digital workspace. Evernote is the place to collect inspirational ideas, write meaningful words, and move your important projects forward.
CrashPlan - CrashPlan for Small Business backup software offers the best way to back up and store business & enterprise data securely - offsite, onsite & online in the Cloud.
EagleFiler - EagleFiler makes managing your information easy.
ManageWP - ManageWP is a service for bloggers, site owners and web based companies helping them manage multiple WordPress sites from one dashboard.