I carry around a USB drive with me - usually a Sandisk Ultra USB, but occasionally a SSD drive1. It usually comes in handy, as I either want to carry around my documents and images or need to transfer files between devices. However, the most common use, is for work files so that I can edit/continue working whilst I’m away from the office and I cannot connect to the VPN or to overcome the poor VPN speeds.
One of the few programs I really miss from macOS is nValt. I used that (rather than Notational Velocity) for a number of years for storing notes and stored everything in it from blog posts, to research notes and paper reviews. It worked well and I preferred it to Evernote. Since then however, I’ve discovered Zim Wiki and I use that for storing my data that where I may need images, as at the end of the day, it saves data as a text file still, so I’ll be able to access it at a later date wherever.
Zim is a notebook type software - think Evernote or Onenote. However, it’s free and open source and saves data locally. It also saves all files as plain text, so you can access the files however and wherever you want. I’ve been using it for a journal for a period of about three years now and I’ve written about it before. I did for a time switch back to Day One and tried the new syncing service, but when they had syncing issues earlier this year which exposed private data, I made sure I was back using Zim (syncing between my devices with Resilo Sync and stored on my own devices).