I'd just use Evernote and use Zapier or IFTTT to back up entries to gdrive/dropbox etc. Fairly decent app functionality across iOS/Android/Windows/Chrome OS/Mac OS. Great build in tagging, ok searchability and even with a free account you'll still be able to add the occasional photo or small PDF relevant to your entry.
I have my Google calendar and Automatic driving history dump to Evernote in appropriate notebooks. The weather also gets added to my Google calendar so gets recorded for each day. Everything gets backed up to my gdrive too as spreadsheets.
Similarly, call logs also get backed up to my gdrive via IFTTT and I use 3 different apps to back up my SMS every 3 days which get filed a few different places.