Travellers who use digital cameras have long relied on flash memory cards to protect their precious memories until they return home and stash them on their computers. But Web-based storage services are increasingly becoming an attractive option for uploading images on the fly, too.

A man bathes near St Petersburg for the Russian Orthodox Epiphany

Great image of a man in St Petersburg for the Russian Orthodox Epiphany Image by (AP Photo/Dmitry Lovetsky)

Here are some of the updated options for online image storage:

In August 2014, Dropbox tripled the amount of storage it offered. It now charges $9.99 a month (or $99 a year) for 1 terabyte of space, with 2 gigabytes available for free.

The move is similar to a recent one from Google, which in March 2014 began charging $9.99 a month, or $99 a year, for 1 terabyte of storage, on its Drive platform. The first 15 gigabytes are free.

The Taj Mahal.

The Taj Mahal. Image by LASZLO ILYES / CC BY 2.0

In autumn 2014, Apple debuted a photo storage function on its iCloud Drive storage platform. The first 5 gigabytes are available for free, while using up to 1 terabyte of storage costs $19.99 a month.

A seal photobombing via drone in South Georgia.

A seal photobombing via drone in South Georgia. Image by Courtesy of www.airpano.com

In late March 2015, Amazon introduced unlimited photo storage for a fee of $11.99 (US) a year on its Cloud Drive storage service. Previously a user could only store 5 gigabytes for free.

Microsoft has also been touting the appeal of using its OneDrive cloud-based storage service for keeping photos. It charges $6.99 a month, or $84 a year, for 1 terabyte, though the first 15 gigabytes are free.

The least expensive offer is from Yahoo’s Flickr, a service that charges nothing for 1 terabyte of photo or video storage, with a $49.99 a year fee for users who prefer advertisements to be removed from the pages displaying their photos.

(For reference, a gigabyte can store about 150 average-size digital photos, while a terabyte of photos could store about a half million ordinary-sized digital photos.)